I really like the lifehack.org site, they put out regular nice essays on living and working better. It's very different from lifehacker.com in that they really focus on improving your habits and stuff, much more focused.

Do you want to be as productive as many of us, but missed a lot of actions at lifehack.org during the year? Other than subscribing our feed now, I give you a way to catch up with us before 2007 begins. I’ve selected the best 50 life hacks of the year, based on their popularity and contents in different categories. Invest your time - read them. Bookmark this page and mark reading them as one of your new year resolutions.